Motor vehicle



M. TEHEZETTfi MOTOR VEHICLE March 153, 11 $2? mzmm Filed May 19, 1926 9p w w w 9'3 W T .3 Egg/r5 4 a 14/; j e 1' 54:

- arrangement have been used.

lld iio a n w n ry-g r i; "ways :1 A lr l t it it he MILTON TIBBETTS,91b DEI'BQIT, MICHIGAN, ASSIGNOR TC PACKARTD MD'E'IJE twill-t $M?-IEANY, 0E IDETRGIT, MICHIGAN,

.A GORPURATION OF IiEIGHIG-aiih'.

MOTOR VEHICLE.

s izwumij filed May is,

This invention relates to motor vehicles and particularly to brakeoperating; iuecha nism therefor. The invention is especially adapted to'four wheel brakes and it is shown as applied to'a vehiclehaving a pairof front and a pair of rear brakes. k

Most motor vehicles today havdtwo SL133 rate means for operating thebrakes ot the vehicle, usually a hand lever and a toot lever. The footlever is used as a service brake and the hand lever as the standingbrake. It is also desirable that one brake may be used in case of thefailure ofthe other for any reason as by breakage of a connecting partor by carelessness on the part of a worlnnan in connecting the brakeparts,

It is usually desirable that more braking effort shall be applied to therear wheels of a vehicle than to the front wheels though sometimes thereverse is true, and various means for accomplisl iing one or the otherThis applies more particularly to the foot or service ap plication ofthe brakes, it being sutiicient usually to connect the hand lever toonly two of the brakes; more often the rear wheel brakes.

Something more than the ordinary factor of safety is desirable in brakemechanism. Where unusual safeguards can be placed around the operationof a vehicle, the manufacturer is inclined to provide them. Too muchduplication of parts is of course not desirable but where duplication ofbrake connections will serve a uscfulypurpose in an emergency it ishighly desirable to employ them.

It is one of the objects of the present invention to provide inconnection with a brake mechanism such as above described, an additionalmeans which will come intooperation upon the failure of some ofthe parts normally connecting a brake lever with the brakes.

A. further object of the invention is to provide a normally inoperativeconnecting link between one of the brake control levers and the brakemechanism whereby the front brakes may be operated upon impairment-ofthe balanced action between the front and rear brakes.

Other objects and advantages will appear from the following descriptiontaken in connection with the drawings illustrating a pre- 1926. SerialNo. 1110,14 1.

terred embodiment of my invention. and in which: i i

Fig 1 is a plan VliW of the middle portion of a motor vehicle chassiswith briike actuating mechanism embodying the invention; and i i Fig. 2is an elevation :md-partscction tel zen substantially on the line 22 ofFig. 1.

Referring to the drawings, represents a motor vehicle frame comprisingside hers 11 and u cross bur '12. In Fig. l the brakes of the vehicleare indicated diagrammatically as-they may be of any desiredconstruction. The front brakes are shown at 1.3 end the rear brakes at14:, and it is intended that these brakes shall be operated eithersimiih taneously or in pairs independently accord-- mg to the conditionsoi For operating the front pair 0t brakes there is a rock shaft 15 andfor operating the rear brakes there is a rock shaft 16, these shaftsbeing mounted in suitable brackets 1."? connected to the frame. Therocl: shaft 15 preferably terminates just inside the side bars 11 oilthe frame and at each end there is an operating arm 18 connected as by alink 19 with the respective brakes 13, so that the rocking of the shaftwill actuate those brakes. The rock shaft 16 preferably extends throughthe frame side bars and at each end there is an arm 20 and a link 21connecting the arm with the respective brakes 14, so that the rocking ofthe shaft 16 ectuates the brakes M.

A. toot lever 22 is conveniently arranged for the operator and issupported on any suitable part of the frame as by a bracket 23, and ahand lever 2% is pivotally supported on one of the frame side bars 11 asat 25-.

The foot lever 22 is connected to normally operate the rock shafts 15and 16 in substantial unison with balanced action between the shafts sothat the brakes at one end of the vehicle may be actuated with slightlyless pressure than those at the otherend. The connections include a longarm 26 on the rock shaftv 15-, a shorter arm 27 on the rock shaft 18., afloating lever 28 pivotally connected between its ends to the end of thearm 27, as at 29, a link 30 connecting the end of the arm 26 with oneend of the float-z ing lever 28, and a rod 31 connecting the other endout the floating lever 28 with an arm on the lever 22 With this mechsnism it will be seen that when the lever 293 is operated the arms 26 and27 Will be drawn toward each other with balanced or constantly relatedaction between them so that the shafts l5 and 16 are rocked and thefront and rear brakes actuated. This is the normal operation of ell fourbrakes of the vehicle and this mechanism is, generally speaking, termedthe-service brake.

For a standing brake, that is a brake to hold the vehicle'when parked,the hand lever 24 is connected to one of the rock shafts, preferably therock shaft- 16, through a rod 33 and an arm 34, the latter beingconnected to the rock shaft 16. The rod 33 has a pin and slot connection35 with the arm. 5% so that the shaft 16 may be rocked by the fool;lever Without at the some time rocking-the bend lever 24-. Also, thepivotal connection 29 is in a slot- 36 in "the floating lever 28 so thatthe pin 29 may move in said slot 36 when the shaft 16 is rocked by thehand lever and thus cause no corresponding move ment of the foot lover.Any usual or suitable means, not shown, for retaining libs hand lever inils set position may be used.

With the above construction the rear brakes i l may be actuated by thehand lever 24;- regardless of What may happen to the describedconnections between the foot lever 22 end the rock shafts. In order thatthe front brakes may also be operated even though there should be a.failure of some of the de scribed connections to the rock shafts, a

second connection is used from the foot, lever 22 to the rock shaft 15.This connection is in the form of an adjustable compression rod 37connected at its front end to an arm 38 on the lever 22 and at its rearend to the arm 26, as at 39. The adjustment of the rod is shown at 4:0and the connection 39 is shown as a pin and slot or lost motionconnection. in the normal adjustment, the pin of said pin and slotconnection is arranged near the middle of the slot so that the balancedconnections between the rock shafts may be eilective.

From this construction it will be seen that even though any or all ofthe connections other than the rod 37, arm 26, rock shaft 15 and rods 19should fall, the two front brakes could be actuated by the foot lever22. This corresponds to the arrangement by which the hand lever 24 mayactuate the brakes 14: upon failure of all of the described connec tionsother than the rod 33, arm 34;, rock shaft 16, and rods 21, and yet thebalanced action between the front and rear brakes is in no Wayinterfered with in the normal operation of the service brake.

While I have herein described in some detail a specific embodiment of myinvention, which I deem to be new and advantageous and may specificallyclaim, I do not desire it understood that my invention is lim ited tothe eiraci details of the construction,

as it will be apparent that changes may be niade therein withoutdeparting from the spirit or scope of my invention.

Having thus described my invention, what I claim and desire to secure byLetters Jutent is:

1, In a motor vehicle, the combination with a front and a rear brake, ubrake operating: lever, and means connecting the lever to the brakes foroperating said brakes with balanced action between them, of normallyinoperative means for operating ae'leust one of said brakes from saidlever upon impairmentof parts to an extent suiiicient to destroy thebalanced action.

In a motor vehicle. the combination with a pair of front brakes and apair of rear brakes, an operating lever for said brakes, and meansconnecting the lever to the brakes for operating said brakes withbalanced action between the pairs,.of normally inoperative means foroperating at least one of said pairs of brakes from said lever uponimpairment of parts sus'i'icien't to destroy the balanced action.

3. ln a motor vehicle, the combination with pair of front brakes, adevice for operating said brakes Without equalization between them, apair or" rear brakes, a, device for operating said rear brakes Withoutequalization between them, on operating lever for all of said brakes,and means connecl-ing said lever to said device for operating the brakeswith balanced action between the de vices, of normally inoperative meansfor operating at least one of said devices from said lever uponimpairment or failure of ports that destroy the balanced action betvvensaid devices.

4. in a motor VilllOlQilhE combination with two rock shafts foroperating separate brakes, a lever, and means for rocking said shaftsfrom said lever with balanced action between them, of a nrnrmallrinoperative connection from said lever to bne of said rock shafts forrocking that shall:- upon impair-mono of the balanced action betweenthem,

5. in a motor vehicle, the combination of front brakes and rear brakes,an operatinglever, scans connecting said lever to said brakes foroperating the letter with balanced action between the front and rearbrakes, and a second lever connected to one pair of brakes for operatingthem independently of the other pair of brakes, and nor mallyinoperative means connccied to open ate said other pair of brakes uponfailure of thebrnkes to which said second lever is con nected.

6 In a motor-vehicle, the combination with a pair of front brakes an apair of rear brakes, on operating lever for said brakes, and meansconnecting the lever i0 Hill ' neee ee with a pair of front brakes and:i pair of rear brakes, of on operating lever, means connecting saidlever to the brakes for operating them wirh balanced action between thepairs, a link having lost motion connec tions between said lever and thefront brakes whereby said link is normally inopererive but will operateseid front brakes upon the failure of said rear brake connections, asecond lever and a connection from said second lever to the rear brakesfor operating the latter independently of the other brakes milconnections.

8. In e motor vehicle, the comhinetion Wirh rworock shorts for operatingseparate lorelres, e lever, enfl means for rocking seiol shafts fromseicl lever with balanced action between them, of normally inoperativemeens for operating er. lease one or seid rock shores upon impoirment orfailure of ports that olesiro Y the balanced action -helm/sen seirishe'- fee,

S lo a motor Vehicle, ihe combination of 2 pair offroniz hrekes emi epair of rear loreires, en 'operzieine" lever for seiri lorelres, meansconnecting the lever to the hrelres fior operating all of saiil brakes,anri e, normelly ino erefnve connecitioii between seicl lever a on oneof said pairs ofrQrekes for operaring the front brakes npoii failure ofthe rear broke conneerions. I y

In testimony whereof ii Hlfix my signature.

MILTUN TEBBETTS.

